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Hi...can we create a variable "a" with double array type ? . Thank.

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super bad
super bad 2017-10-12
评论： Rik 2021-1-25
i did tried commands : str2num,str2double...but it not true
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Jan
Jan 2017-10-12
Your English is fine enough to explain the problem with more details. I'm not a native English speaker also, like many other users of this forum. Beside the language, it is difficult to explain a problem in general, because as long as it is not solved, it is not clear, which parts are relevant or not. Simply try to explain it again with more details. Prefer to edit the question, such that the reader find all details in one location.
I'm not "bro", but I have a name: "Jan". I assume, the other persons in the forum not "bros" also. ;-)

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回答（3 个）

Adam
Adam 2017-10-12
a = 7;
is a variable 'a' of type double.
Or even
a = [];
is also type double, but with empty contents.
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super bad
super bad 2017-10-12
No bro It is not so easy. I want to create a matrix has value is 'a'. 'a' function is like a number and in the form of double array in class...can we do it?

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John D'Errico
John D'Errico 2017-10-12
编辑：John D'Errico 2017-10-12
You want to create an array that has double precision class, thus a "double", but contains a string, 'a'.
Sorry, but you cannot do so. A double can contain ONLY numbers. Those elements must all be of class double.
If you create an array that contains a string, 'a', it must be either of class char, or a cell array.
A = 'a'
A =
'a'
B = {'a'}
B =
1×1 cell array
{'a'}
whos
Name Size Bytes Class Attributes
A 1x1 2 char
B 1x1 114 cell
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super bad
super bad 2017-10-12
a,b is the coefficient in front of s , if (a or b) is a string or symbol then we were wrong
Jan
Jan 2017-10-12
@super bad: This sound really magic. I still do not have any idea, what you are talking about. What is "a", "b" and "s"? What are your inputs, what is the wanted output and which problem do you try to solve? Why do you want to operate on "strings", "symbols" (what ever this is) and numerical matrices at the same time?

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Mridul Gandhi
Mridul Gandhi 2019-6-9
Maybe you mean this:
I=5;
J=5;
a=sym('a',[I J]);
Creates variable 'a' of size (IxJ):
a =
[ a1_1, a1_2, a1_3, a1_4, a1_5]
[ a2_1, a2_2, a2_3, a2_4, a2_5]
[ a3_1, a3_2, a3_3, a3_4, a3_5]
[ a4_1, a4_2, a4_3, a4_4, a4_5]
[ a5_1, a5_2, a5_3, a5_4, a5_5]
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Rik
Rik 2021-1-25
As detailed in several comments: that is not possible. There are many options of what you could mean in this thread. Which do you want?

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